2001-2003 superduty diesels use have the 7.3 powerstroke which is the most wanted trucks, 2004-2007 have the 6.0 powerstroke which have problems with the head gaskets, eger, etc. If you do get the 6.0, I would try and get $5k off the price and bring the truck straight to a shop and get is bulletproofed (engine wise). Those are the diesels, I would NOT get the 5.4 motor in a truck that big. The v10 was a 2valve up untill 2005 or so I believe then it switched to 3valve.
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